GE Discovery 630 NM vs GE Discovery NM/CT 670
GE's Discovery 630 NM and Discovery NM/CT 670 are two of the most popular dual-head nuclear medicine platforms on the refurbished market — but they are not the same product. The Discovery 630 is a nuclear medicine / SPECT-only system with no CT, while the Discovery NM/CT 670 is a hybrid SPECT/CT with an integrated 16-slice diagnostic CT.
Side-by-side specifications
| Specification | Discovery 630 NM | Discovery NM/CT 670 |
|---|---|---|
| Detector heads | Dual-head NaI | Dual-head NaI |
| CT subsystem | None (NM / SPECT only) | 16-slice Optima CT (CT 540) |
| Cardiac SPECT | Standard | Enhanced (Pro / CZT options) |
| Bore size | 70 cm | 70 cm |
| Collimators | LEHR, MEGP, HEGP | LEHR, MEGP, HEGP, fan-beam |
| Typical year | 2014–2020 | 2014–2022 |
| Typical refurb price (2026) | $110,000 – $220,000 | $200,000 – $380,000 |
Clinical positioning
The Discovery 630 NM is GE's all-purpose dual-head gamma camera — strong for general nuclear medicine, oncology, bone, thyroid, renal and planar studies, and tomographic SPECT acquisitions. It does not include CT, so attenuation correction and anatomic localization rely on an external CT or external software fusion.
The Discovery NM/CT 670 adds a fully integrated 16-slice diagnostic CT to the same dual-head NaI gamma camera platform, enabling true hybrid SPECT/CT with CT-based attenuation correction, anatomic localization and standalone diagnostic CT — a better fit for cardiology, oncology fusion imaging and clinics that need fan-beam collimation for brain studies.
Which to buy?
If your case mix is general nuclear medicine and planar / SPECT work without on-board CT, the Discovery 630 NM delivers excellent value at a meaningfully lower price. If you need integrated CT for attenuation-corrected SPECT, dedicated cardiac SPECT/CT or fan-beam collimation, step up to the Discovery NM/CT 670.
GE dual-head NM family hierarchy
GE's dual-head NaI family splits into NM-only and SPECT/CT branches, with newer-generation equivalents on each side. Use the matrix below to position the 630 and 670 against their siblings:
- Discovery 630 — dual-head NM / SPECT only, no CT.
- Discovery 670 — SPECT/CT with integrated diagnostic CT.
- Discovery 830 — newer generation of the 630 with software and workflow improvements; still NM / SPECT only, no CT.
- Discovery 870 — newer generation equivalent of the 670; includes integrated CT.
- Optima NM/CT 640 — SPECT/CT system that includes CT.
| Model | Category | Integrated CT | Generation | Refurb availability (2026) |
|---|---|---|---|---|
| Discovery 630 | NM / SPECT | No | Current generation | Widely available |
| Discovery 830 | NM / SPECT | No | Newer generation of 630 | Limited today, expected to grow |
| Optima NM/CT 640 | SPECT/CT | Yes | Entry SPECT/CT | Available |
| Discovery 670 | SPECT/CT | Yes (16-slice) | Current generation | Widely available |
| Discovery 870 | SPECT/CT | Yes | Newer generation of 670 | Limited today, expected to grow |
Secondary market availability of the 830 and 870
Used Discovery 830 and Discovery 870 systems are currently less common on the secondary market because the installed base is younger and most early adopters are still operating their systems clinically. Availability of refurbished 830 and 870 units is expected to increase steadily over the next several years as first-generation deployments rotate out and trade-ins flow into the refurbished channel.
In the meantime, the Discovery 630 (NM / SPECT only) and Discovery NM/CT 670 (SPECT/CT) remain the most accessible and best-supported refurbished options in this family.
Frequently asked questions
- What is the difference between the GE Discovery 630 and 670?
- The Discovery 630 is a nuclear medicine / SPECT-only dual-head gamma camera (no CT). The Discovery NM/CT 670 is a hybrid SPECT/CT system that adds an integrated 16-slice diagnostic CT, enhanced cardiac SPECT and fan-beam collimator support on the same dual-head NaI platform.
- How much does a refurbished GE Discovery 630 NM cost?
- In 2026 a refurbished GE Discovery 630 NM typically sells between $110,000 and $220,000 depending on year, collimator package, software and installation scope. Because the 630 is nuclear medicine only (no CT), it sits below the SPECT/CT 670 in price.
- Is the NM/CT 670 worth the price premium?
- If you need integrated diagnostic CT for attenuation-corrected SPECT, hybrid SPECT/CT fusion or fan-beam collimation, yes — the 670's on-board CT and additional automation pay back quickly. For planar and SPECT-only nuclear medicine work, the Discovery 630 NM is the better value.
- Does the GE Discovery 630 include CT?
- No. The GE Discovery 630 is a nuclear medicine / SPECT-only dual-head gamma camera and does not include CT. The Discovery NM/CT 670, Discovery 870 and Optima NM/CT 640 are the GE SPECT/CT systems that include integrated CT.
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